I have downloaded NEI and the file doesn't open when ever I click on it for some reason, I have Java 64-bit and & the latest version of Minecraft.
I would appreciate any reply.
NEI isn't a standalone mod
You will need Forge to run this mod
Download Forge: http://files.minecraftforge.net/
Use the same version as NEI is
Click on the Forge installer - OK
Start Minecraft and make sure the Forge profile is set
Start the game and close it in main menu
The go to /.minecraft/mods/
and put the NotEnoughtItems.jar in it
Start the Forge profile again